I've seen a ton of bad anime, but in my opinion if someone wanna watch them, so be it. I'm not one to tell people not to watch something.

However, some of the worst anime I've seen are:

Eiken- I can't think of a single redeeming factor for this anime. It's tasteless, unfunny, unsexy, irredeemable, disgusting trash. Everything from the one dimensional characters, awful and inconsistent animation, generic and forgettable music, terrible voice work both Japanese and English, and lack of any sort of story or plot. I've seen hentai that had more class, plot, and better animation than this vile, unwatchable garbage. If you think HighSchool of the Dead was bad with its fanservice, you'll faint if you ever decide to watch this piece of shit. This is seriously the worst anime I've ever seen. I just can't squeeze any sort of enjoyment out of this, not even ironically.

The Rebirth of Buddha- It's a Buddhist propaganda film, with so little effort put into it that it feels like it should have the budget of Mars of Destruction, and aired on a religious network, but instead it has a budget and screened in theaters with an all-star Japanese voice cast. The movie feels like a bad episode of Captain Planet, but with Buddha. There's a part with an alien invasion destroying a city Independence Day-style. I am not making this up. I feel like this movie was a waste of everyone's time and money.

Apocalypse Zero- This anime is basically a 90s Panty and Stocking minus all the fun. It's needlessly and uncomfortably violent, and I love my gory violence. It grows increasingly graphic and perverse, and it has a hideous art style. Like Eiken, it lacks any taste whatsoever, and it's not even enjoyable for how ridiculous it is. You just feel unpleasant and disgusted watching it. It's just not a fun watch, and it's not even like the anime is taking itself too seriously, because it's not. It has a fairly goofy Super Sentai theme going. It would be at least tolerable if the story was any good, but it's not. What sort of post apocalyptic society would have their high school above ground where grotesque monsters roam around the ruins, and even have them takes trips INSIDE these ruin cities with absolutely NO protection, where said monsters can easily rip their faces off? And the schools only protection against these powerful beasts are a handful of armed grunts? Why is the main leads brother looks and shaped like a woman, but they keep referring to her as a "him" and they never mention or establish if he's a transvestite or shemale or not?

Penguindrum- I literally feel like the only person who actively hate this anime. Everyone I've heard from say it's a masterpiece, and while I'm not one to tell them they're wrong, it just irritates me increasingly every time I hear this thing get praised. Yes, this is seriously one of the worst anime I've sat through, just for the amount of anger it fueled in me. It was such an infuriating sit for me. The style was repetitive, and paced painfully slow, the characters lacked any believability, the dialogue was comprised of the most trite philosophical drivel you hear in almost every anime, coming out of the mouths of every character, including the children, a flashback every five seconds, and it's clear that the anime's main concern was not to tell a cohesive, believable story, but to shove as much symbolic schlock down your throat until you choke. It throws so much twists and new plot points that not even the anime could keep up with itself. Sure, there are some nice things I can say. It made me laugh a few times, and at first I found the character behaviors to be strangely charming, but as it went on it started taking itself way too seriously, and all those good feeling quickly "disappeared" like those fucking kids in that fucking child broiler. I tried watching Revolutionary Girl Utena afterwards, which is from the same creator, because I wanted something to like, but I didn't even like that "classic"

Nerawareta Gakuen- This was probably the angriest I've been watching an anime since Penguindrum. The movie looks pretty, but the story was... well, there wasn't any. Not even any of the synopsis I've read can tell you what the movie's about. It's just a sequence of horribly told events. When the movie isn't boring as hell, it's bafflingly bad. The main character's an idiot, and his love interest is overly abusive even for a tsundere. The other main character is probably the most interesting but even he's forgettable, and his love interest has nothing to do with anything in the movie. There's a student council in this movie make the student council in Kill la Kill look reasonable. The film also has this strange hatred for cellphones. This was just another infuriating sit.

Those are the ones that really get on my nerves. The other bad stuff I've seen I usually enjoy for their shittiness. Such as:Mars of DestructionGarzey's WingMaster of Martial HeartsSkelter HelterPanzer DragoonSleeping with HinakoSchool Days

You may not know this, but I love watching shitty anime.

EDIT: I'd like to add two more to the shit list:

Amnesia- A reverse harem anime from our good friends Idea Factory, the guys who brought us such masterpieces as Mars of Destruction and Skelter Heaven. While I see what this anime is trying to do, the execution is god awful. It's one of the most boring things I've bothered sitting through, and features one of the worst female leads I've ever seen in an anime. I've never seen a more useless, bland, idiotic empty husk of a heroine in my life. She has no personality or character, does nothing, doesn't say anything meaningful, and has such a passive reaction to everything around her. Have a guy lock her in a cage, and her only reaction is "well, uh... okay.". Have a guy nearly strangle her, threatening to kill her, and the minute he stops and apologizes, she reacts with "No... I'm fine." It's not a case that she has no memories, it's that she has no character whatsoever. Throughout the entire anime, she simply waits for shit to happen to her and rolls with it. She doesn't even have a name, for Christ's sakes. Also, the designs are just odd. The main characters dress like chess boards going through their goth phase, and no one ever addresses it. It's not like this takes place in a world of fantasy or scifi either, it's the normal, modern day world, and the guys (mostly) act normally. It's really distracting. The designs of the eyes are weird as well.

Diabolik Lovers- Another reverse harem from Idea Factory, both of which are from 2013. While there's a few steps up from Amnesia; The main girl here is better than the excuse for a heroine in Amnesia, and the episodes are only 15 minutes, but this one is somehow worse. This is probably the most vile, wretched, hateful anime I've seen all year. Throughout the whole anime, this helpless girl is constantly being harassed, threatened, forced upon, verbally abused, and treated horribly by these vampire boys, while also getting enough blood sucked out of her to give Elfen Lied a fun for its money. All the male characters are completely unlikable with no redeeming qualities whatsoever, one of them even straight-up refer to the girl as "Bitch-chan". What's more is that the girl, despite being treated like shit, constantly tries to get involved with them, and never tries to escape. There's a part where she gets a silver knife that can kill them, but she never uses it against them. And no, there isn't a single part where she connects or opens up to any of them. There's not a single part where they grow fond of her and start treating her kindly. This isn't like Beauty and the Beast. Any moment where it seems like the male characters are displaying some kind of likable trait, they immediately destroy it by sucking her blood and talking shit to her for the millionth time. This whole anime was just unpleasantness throughout. I felt disgusted watching it. It wasn't like Amnesia where I was mostly bored, this was pissing me off. The fact that this is suppose to appeal to girls and is trying to sell itself as a romance is astonishing to me. The fact that the girl does nothing against these horrible, horrible males and somehow gets infatuated by them is beyond idiotic. The fact that Kill la Kill is getting pegged for sexism while this goes largely unscathed is absolutely insulting.

I'm told that it's suppose to be a classic and really thought provoking but I just found Serial Experiments Lain rather boring. The general consensus is probably that I just didn't get the anime but I don't really think that's the case. I found it maddeningly boring and just seemed to tried to hard to be a cerebral anime. I had to struggle to get through it.

Attack on Titan, the anime honestly had a great start but as time went on there was less and less action and more talk. The ending itself left the possibility that there would be a second season (I've read the manga and there should) but I feel like it'l end up just like HSOTD which had a great start and decent action but never got a second season and the anime aired back in 2010 and the OVA in 2011 which was a slight extension.

What I tend to look for in anme is a decent pace of action, character development and overall story, Animes Ghost in the Shell have a CSI theme going but still keeps up the pacing and action, Outlaw Star and Cowboy bebop back in their days along with Trigun could do the same, but something like Attack on Titan just dragged on for me and felt like a slog of episodes with nothing but a few terrified and surprised people and then eventually a titan would show up.

Anything based off of a video-game. Unless you are a fan of the series it was based off of. All the ones I put myself through were pretty terrible, but all worth it for me because I get to see more personality of characters I'm invested to going in.

OT: I have seen a lot of shit anime, but one that sticks out in my mind is Rin. Holy shit is it bad. Do you enjoy when your protagonist is torture raped/killed every episode? Sometimes, more than once? Well, I've got an anime for you, my friend!

Also, why the fuck were all the characters naked for the entire last episode? Fucking schlock. Stay away.

OT: I have seen a lot of shit anime, but one that sticks out in my mind is Rin. Holy shit is it bad. Do you enjoy when your protagonist is torture raped/killed every episode? Sometimes, more than once? Well, I've got an anime for you, my friend!

Also, why the fuck were all the characters naked for the entire last episode? Fucking schlock. Stay away.

Is Rin, Mnemosyne? It's what I found after google.

If it is, well, it's not that bad, I liked the fact time passes and we met three generations of a family.

An anime that tried to cash in on the violent cyberpunk craze of the 80's. It's one of the most revoltingly meanspirited things I've ever seen. This would be excusable if it had an interesting story, or just one you could simply follow. But it just makes shit up as it goes along, and awkwardly fumbles from scene to scene with no pacing or context whatsoever.

The plot moves at a glacial pace, with way too much pointless filler between fights. Even the fights themselves are tedious. The combatants spend most of the time floating in place while grimacing and yelling like they're suffering from a chronic case of constipation. What's worse, when one of them starts charging an ultimate-bullshit beam attack, the opponent does ABSOLUTELY NOTHING to prevent it, instead opting to stay in place and stand there all idiotic and slack-jawed. Just fly up there and punch him already, dammit!

Go watch Team Four Star's Dragon Ball Z Abridged instead. It covers the main plot points more succinctly and is way more entertaining to boot.

I am going to go really broad here. 90% all Anime that are not movies, 90% of all movies. 100% of all movies based on a anime series or a game.But I am just being an asshole here:If you didn't start watching and didn't get into Naruto (along side with movies and side-content) don't even bother trying. Unless you have time and access to all 550+ episodes and all the movies. They explain nothing, merely reference earlier things. Which to be honest I find good because otherwise every episode would be 10/22 minutes of recapping earlier things.

Also another note in C-minor:Why does animes need title sequence and end credit sequences that can easily take 7 minutes of 22 minute episode + the Ad break screens which there can be up to 3 in 22 min episode.And why the hell the title sequence has never anything to fucking do with the Anime itself.

Honestly:Something just happened around the age of 16 to me: I lost interest and care for all Anime and very much most of Manga. (I still do own All Akira books and few things like that). Even something I started to watch and enjoyed a lot, i.e Planeteers (Also not recommended unless you want the same arc of drama IN EVERY EPISODE! And the female protagonist has the IQ of kitchen sponge!). But I don't know I just can't seem to enjoy that stuff anymore, not even the art style, specially not the art direction on most of them. Somehow I disliked the idea of chekhov's gun being introduced 5 minutes in after title sequence (WHY THE FUCK DOES ANIME MOVIE NEED TITLE SEQUENCE?!)- does not apply to all movies).Even Steamboy which is easily my favorite ones and start quite grounded on reality go off the balls towards the end.

Now that I think about it: I lost the taste for them around the time I started doing my Drama, Art and Music combined specialization along side with my Academic graduation. And the final stave was very quickly driven in with me starting my animation studies (still on going)Somehow I started to appreciate European comics, animations more and their art-style/art direction more.

Penguindrum- I literally feel like the only person who actively hate this anime. Everyone I've heard from say it's a masterpiece, and while I'm not one to tell them they're wrong, it just irritates me increasingly every time I hear this thing get praised. Yes, this is seriously one of the worst anime I've sat through, just for the amount of anger it fueled in me. It was such an infuriating sit for me. The style was repetitive, and paced painfully slow, the characters lacked any believability, the dialogue was comprised of the most trite philosophical drivel you hear in almost every anime, coming out of the mouths of every character, including the children, a flashback every five seconds, and it's clear that the anime's main concern was not to tell a cohesive, believable story, but to shove as much symbolic schlock down your throat until you choke. It throws so much twists and new plot points that not even the anime could keep up with itself. Sure, there are some nice things I can say. It made me laugh a few times, and at first I found the character behaviors to be strangely charming, but as it went on it started taking itself way too seriously, and all those good feeling quickly "disappeared" like those fucking kids in that fucking child broiler. I tried watching Revolutionary Girl Utena afterwards, which is from the same creator, because I wanted something to like, but I didn't even like that "classic"

The thing is. Some of the people who even LIKE Penguindrum, admit that it's pretty bad. Anything by Ikuhara is bound to be polarizing.

I originally watched it because I confused the title for Outlaw Star. Big mistake. Instead of space adventures I got high schoolers talking about crap. Fans of the show claim that "It is about nothing." Wrong. It is about something, just nothing interesting. Most boring show that I have ever seen. If you like dialogue reliant inside jokes that require trivial knowledge of another culture to understand, then the show is for you, but it's sure as hell not for me.

Full Metal Panic. Normally, I would say this series is merely boring, with unfunny jokes, stereotypical main characters you will find in just about any other anime, and a story that is hardly worth mentioning.

HOWEVER, this series also has the absolute WORST fictional character I have ever encountered; Teletha "Tessa" Testarossa. Awesome name, HORRIBLE character! Maybe it's just me, but the very sight of her makes me rage! She is basically a Mary Sue given flesh! She is SOOO pretty (par for the course with anime, but whatever), she is a natural tactical genius, she manages to win a mech-battle against a seasoned veteran after just a few hours of training, she is a high-ranking commander despite being 16 years old or something and despite her being incredibly immature in her actions, she has that cutsey-poo voice that is annoying enough to make me want to rip my own ears off, and, of course, we are supposed to ROOT for her! When the villian enacts his great masterplan and holds her hostage at gunpoint, my reaction was basically "Just shoot her! Put her out of our misery!" Which is generally a surefire sign that something has gone wrong.

Like I said, that is just my opinion of Full Metal Panic. And to be fair, there are two episodes that are actually really good; they feature the protagonist, Sousuke Sagara, out on a mission. The episodes basically boils down to Sousuke and his squad being stalked by the villian and a henchman (who Sousuke knows since before), killing the soldiers one by one until only Sousuke remains, interspliced with cuts to the romantic lead, Kaname Chidori, waiting for his safe return. It is a really good pair of episodes, that unfortunately does nothing to elevate my opinion of the series as a whole...

OT: I have seen a lot of shit anime, but one that sticks out in my mind is Rin. Holy shit is it bad. Do you enjoy when your protagonist is torture raped/killed every episode? Sometimes, more than once? Well, I've got an anime for you, my friend!

Also, why the fuck were all the characters naked for the entire last episode? Fucking schlock. Stay away.

Is Rin, Mnemosyne? It's what I found after google.

If it is, well, it's not that bad, I liked the fact time passes and we met three generations of a family.

Better than Anohana :D

Plus, Rin gives you the one scene you've wanted to happen since the very first episode...

OT: Well, this is going to be tough, so I might just end up "recommending" more that not recommending... (Just as a heads up...)

*ahem*

Another - It's like a better Final Destination... and NOTHING'S better at doing what Final Destination does... except Final Destination... (Also, it involves middle school children... Yeah, I said it...)

Shin-chan - If you LOVE the original Crayon Shin-chan, then this version will shit all over it with abridged-like humor! (That's right... This version was abridging WAY before LittleKoriboh... That, alone, makes it unwatchable...)

Haganai - If you're not a dick and/or have no sense of humor for dickatry, then stay the hell away from this "harem" anime...

Gunslinger Girl (Both seasons) - If you'd rather see terrorist always getting shot in the face by little girls instead of actually caring about each of the character's interactions and/or philosophies, then the "boring" button has been set on the "ON" position for you...

Romeo X Juliet - Remember Shakespear's most popular masterpiece known as "Romeo and Juliet"? This series tries to do that story better... and fails hard...

...Okay... Enough of that joking about... Let's actually take this seriously this time... *keeps on joking*

Someone said Sword Art Online, I agree and disagree. The First story arc (that takes place in SAO itself) was pretty good, then it went off the rails badly. Lost all focus and since of urgency (and one of the few villains that can make a mass murderer sympathetic).

High School of the Dead though is defiantly the worst I have ever seen. Started out really good, and then BAM, shot itself with absurd fan-service and sexual-exploitation type scenes.

Since people already said Naruto, imma go ahead and not recommend NGE. I realise that you sort of have to watch it as education if you like anime, but as far as I can tell, it goes from cool premise to that sort of teambuilding filler stuff where they just defeat a new enemy every episode to some fucking creepy shit and ends with...congratulations.

EDIT: To be fair, it should get points for breaking from the typical structure. It's like there's a team of misfits and instead of having a rocky but functional beginning, breaking down and then pulling together for the final triumph, they start off rocky but functional, start showing how serious their issues are, and are still headcases at the anticlimactic end.

Would you believe me if I told you it wasn't the gratuitous violence and nudity that lead me to dislike it? That actually made it salvageable in my opinion and compelled me to make my own take on the anime. No, what brought Elfenlied down for me was the characters. They weren't believable, none of their actions to me seemed realistic or what someone in that situation would actually do. The behaviour of Kouta and Yuka in particular was so surreal to me; I just couldn't invest myself in their fantasy world.

Doesn't matter much though, it's still enjoyable just in a different way.

The most generic anime I have ever seen. Downright terrible jokes, terrible romance, and just so damn boring.

Wow. Didn't think i'd get ninja'd on that one.

It has to be the most boring anime I've ever seen. It's not that I disliked anything about it (didn't really like anything either), it's just that NOTHING HAPPENED. Atleast not by the 8th or 9th episode (stopped watching).

High School of the Dead though is defiantly the worst I have ever seen.

*definitely.

I'm sorry, I have to do that. Although I do agree, except I thought the absurd fanservice was the only reason people watched it. My main experience is a friend showing me a scene where a bullet expertly manouevres through a pair of bouncing tits.

High School of the Dead though is defiantly the worst I have ever seen. Started out really good, and then BAM, shot itself with absurd fan-service and sexual-exploitation type scenes.

To "enjoy" HotD you have to come to terms with that it's not trying to be anything intelligent. Just think of it as an over-the-top trashy action movie with tits, zombies and guns (in that order). And watch the Dub.

EDIT: The only reason I put it aside from other anime that dot he things you described, is that it doesn't PRETEND to have intelligence or a story and throw in constant fan-service and such. It didn't pretend to be something else, which is why I like it.

MD Geist 1 and 2 - picked these up when I thought 'cult hit' meant it was good. Nasty little action peices mainly concerned with destroying the human body in as many ways as possible, and nihilism. Though the nihilism ddoes lead to a jaw dropping twist at the end of part one that almost makes it worthwhile.

Odin - lost about a third of its running time for western release, its unclear whether the extra length would have saved it or just made it boring for longer.

perfectimo:I wouldn't recommend Cardcaptor unless you watched it growing up, but man is it awesome.

Loved Cardcaptor when I was younger. I haven't watched it in a while but I can imagine it would be through rose tinted glasses if I did now.

Its kind of infamous as one of THE hackjob adaptations for american TV. They bought a girl aimed anime, and when they found out that, shock, girls liked it more than boys they:

Cut the first seven episodes entirely

Tried to make a supporting male character introduced in episode 8 into a main character to rival the heroine.

Trimmed or wrote out any romantic elements (though in one case... well, just wasn't gonna fly outside of Japan).

Rewrote the characters to be 'stronger' (read - obnoxious brats made insulting and combative, with any moments of concern showed for another character turned into insults, irritation or concern about something purely material)